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| author | Rafael Espindola <rafael.espindola@gmail.com> | 2012-03-29 03:37:17 +0000 |
|---|---|---|
| committer | Rafael Espindola <rafael.espindola@gmail.com> | 2012-03-29 03:37:17 +0000 |
| commit | be5ff2f830d1833891051472d29818aa9f783cce (patch) | |
| tree | 7bde1df55887737aa0fd5bfb1d0b366fe1a7c22b | |
| parent | 52f10d5f474741d2226630f576d44f1bf946d40a (diff) | |
unwind.h fix for -fvisibility=hidden users. This fixes firefox build in a system
with libunwind installed.
Patch by Jeffrey Yasskin!
git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@153633 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Headers/unwind.h | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/lib/Headers/unwind.h b/lib/Headers/unwind.h index a99c8a1176..a0659203b1 100644 --- a/lib/Headers/unwind.h +++ b/lib/Headers/unwind.h @@ -31,7 +31,19 @@ # define _SHOULD_UNDEFINE_GNU_SOURCE # define _GNU_SOURCE # endif -# include_next <unwind.h> +// libunwind's unwind.h reflects the current visibility. However, Mozilla +// builds with -fvisibility=hidden and relies on gcc's unwind.h to reset the +// visibility to default and export its contents. gcc also allows users to +// override its override by #defining HIDE_EXPORTS (but note, this only obeys +// the user's -fvisibility setting; it doesn't hide any exports on its own). We +// imitate gcc's header here: +# ifdef HIDE_EXPORTS +# include_next <unwind.h> +# else +# pragma GCC visibility push(default) +# include_next <unwind.h> +# pragma GCC visibility pop +# endif # ifdef _SHOULD_UNDEFINE_GNU_SOURCE # undef _GNU_SOURCE # undef _SHOULD_UNDEFINE_GNU_SOURCE |